After continuously administering aphrodisiacs to her aunt for 10 days, she becomes a sex toy capable of unrestrained penetration and orgasms... (Isshiki Momoko ROE-132)

To make my aunt, whom I've liked since childhood, obey me, I concocted an aphrodisiac based on information found online. This spring, while staying at my aunt's house, the moment to test the aphrodisiac finally arrived. Taking advantage of my aunt's inattention, I added one drop, two drops, three drops, four drops to her food, gradually increasing the dosage. My aunt, her body feverish, her breathing rapid, and her body contorted, seemed to have lost her mind. Ten days later, she finally became my submissive sex slave…